So I’ve been on birth control for over 2 years. I usually get bleeding during the placebo pills but for the past four months i haven’t?

I went to the doctors in May and got a pregnancy test and it was negative and i took a pregnancy test last month and it was negative.

I’m sexually active and he usually cums in my mouth or we wear a condom.

I’m just confused on why after 2 years i don’t bleed anymore? I cramp that’s it